My husband is 41 and has been injured 21 years. I'm pretty sure he'll outlive me because he knows I'd kill him if he died first. But it comes up alot, when I married Chad someone close to me basically implied it would be a short marriage because, and I quote, "you never see any old quads". Pfffft.

KLD - you are incorrect about an average. An average is the sum divided by the total. The median is the point at which 50% of people fall above and below. For example:

1 + 1 + + 4 + 6 + 100 = 112

average (also called the mean) = 112 / 5 = approx 22

The median here would be 4 as half the observations fall below (1 and 1) and half above (6,100).

Especially when the distributions are not uniform, the mean and median can be very different.

A lesson from your friendly statisician.

KLD - you are incorrect about an average. An average is the sum divided by the total. The median is the point at which 50% of people fall above and below. For example:

1 + 1 + + 4 + 6 + 100 = 112

average (also called the mean) = 112 / 5 = approx 22

The median here would be 4 as half the observations fall below (1 and 1) and half above (6,100).

Especially when the distributions are not uniform, the mean and median can be very different.

A lesson from your friendly statisician.

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